Gotcha. I assume you were planning on locking the chest up. You could unpop the coupler and get the same results as the extra shut off without worrying about contaminating or foaming the beer. By unpop I mean release the plunger that pushes the ball down on the keg opening. You don't have to untwist the coupler like you're completely removing it. Just make sure you release it all the way so that the gas line gets cut off too. Otherwise go for a faucet lock. Perlick makes a nice all metal one.
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